Hi Pam - we also have a '75 Argy with the front door. When we bought ours, the ceiling was soooo sticky that bugs & gnats were stuck to it!
So, we used the citrus base De-Solve-it contractor's solvent, rinsed well, then used a good vinyl cleaner. Once clean, we applies acrylic flloor wax to the ceiling to prevent that sicky feeling returning.
We also have a table with two aluminum legs. There are two sets of legs - one long for "table mode" & one short set for "bed mode." If you look at our pictures, you can see the green table. I'll have to measure it; it seems it's about 48" long by 20"+ wide. Basically, it fills in the "L" shape to make a bed.